Comprehensive Javascript detector of whether a variable contains actual content

hasContent.js

//Comprehensive check for whether or not a Javascript variable has actual content
var hasContent = function(input) {
    if (typeof input === 'number') {
        if (isNaN(input)) {
            return false;
        };
    } else {
        if (input === 0) {
            return false;
        }
    }
    if (typeof input === 'object') {
        if(Object.getOwnPropertyNames(input).length === 0){
            return false;
        };
    };
	if (input === null || input === {} || input === false 
	    || input === "" || input === undefined) {
	    return false;
	} else {
	    return true;
	};
};

//Usage
hasContent(someVariable);  //returns true if someVariable has content